Related post MSN Adcentre Sucks Part 1
After about 2.5 weeks of calling the Adcenter customer support I finally got an answer today. MSN Adcenter displayed ads that I had paused a week back. Apparently their system cannot pause the ads the moment you click on pause , ( They actually told me that their system was not as advance as Google to pause ads instantly ) the ads stop after about 2 hours of displaying & burning your PPC budget. And in extreme cases it can keep running till you figure it out and call their help centre to stop it.
My ads kept running till I happen to see them on MSN search. The ads wont stop till they figure it out which may take 5-7 days ( which I was told during my initial conversation with them ) or may take 2.5 weeks like in my case. They refunded me USD 39.70 for the ads that generated clicks after they were paused.
Their system is in a total mess, if you advertise with them I can only recommend you to keep a tight watch on your displayed ads. I ve stopped all my PPC campaigns on MSN after this incident.